Re: [PATCH wpan-next v2 14/14] net: mac802154: Introduce a synchronous API for MLME commands

[Alexander Aring <alex.aring@gmail.com>]

Hi,

On Mon, Feb 7, 2022 at 9:48 AM Miquel Raynal <miquel.raynal@bootlin.com> wrote:
>
> This is the slow path, we need to wait for each command to be processed
> before continuing so let's introduce an helper which does the
> transmission and blocks until it gets notified of its asynchronous
> completion. This helper is going to be used when introducing scan
> support.
>
> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
> ---
>  net/mac802154/ieee802154_i.h | 1 +
>  net/mac802154/tx.c           | 6 ++++++
>  2 files changed, 7 insertions(+)
>
> diff --git a/net/mac802154/ieee802154_i.h b/net/mac802154/ieee802154_i.h
> index 295c9ce091e1..ad76a60af087 100644
> --- a/net/mac802154/ieee802154_i.h
> +++ b/net/mac802154/ieee802154_i.h
> @@ -123,6 +123,7 @@ extern struct ieee802154_mlme_ops mac802154_mlme_wpan;
>  void ieee802154_rx(struct ieee802154_local *local, struct sk_buff *skb);
>  void ieee802154_xmit_sync_worker(struct work_struct *work);
>  void ieee802154_sync_and_stop_tx(struct ieee802154_local *local);
> +void ieee802154_mlme_tx(struct ieee802154_local *local, struct sk_buff *skb);
>  netdev_tx_t
>  ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev);
>  netdev_tx_t
> diff --git a/net/mac802154/tx.c b/net/mac802154/tx.c
> index 06ae2e6cea43..7c281458942e 100644
> --- a/net/mac802154/tx.c
> +++ b/net/mac802154/tx.c
> @@ -126,6 +126,12 @@ void ieee802154_sync_and_stop_tx(struct ieee802154_local *local)
>         atomic_dec(&local->phy->hold_txs);
>  }
>
> +void ieee802154_mlme_tx(struct ieee802154_local *local, struct sk_buff *skb)
> +{
> +       ieee802154_tx(local, skb);
> +       ieee802154_sync_and_stop_tx(local);

Some of those functions can fail, in async case we can do some stats
but here we can deliver the caller an error. Please do so.

- Alex